Longtime O'Reilly fans voiced their anger on Facebook. Unfortunately, Fox had yet to post any content related to the departure of the embattled former host on its page — so they took their concerns to the comment sections of unrelated posts.

Beneath a story on U.S. Army veteran Earl Granville, who ran the Boston Marathon after losing part of his leg in Afghanistan, O'Reilly fans spared no mercy.

"Fox News is off my viewing list," one commenter, Michal Brendsel, wrote. "I will only watch Hannity until you decide to give in to the liberals and find a way to take him off too. Oh and advertisers — won't be buying your stuff again."